Well is it worth it? And if it happened will there be story? Saturn is a gorosei and they surely could find Kuma anyhow and kill him way before if we think about it realistically and as it happens in the real life but would this story exist if there was realism? No, they couldn't find a fruit is a silly thing too but story wise it isn't. This isn't science fiction so its fine.
We know the end result of Kuma's story, what he there is connecting the dots.
It is fine that this dude came back once. No need to do it again and again, it's repetitive at this point.
Surely Oda could've found a better way to connect the dots after he got beaten by Kuma the first time?